Average Bench: 77.3% (61st of 115)

Based on 2,035 user benchmarks.  Model: Corsair CM4X8GF2666C18S2 2x8GB

Good average bench

The Corsair CM4X8GF2666C18S2 2x8GB averaged 22.7% lower than the peak scores attained by the group leaders. This is an excellent result which ranks the Corsair CM4X8GF2666C18S2 2x8GB near the top of the comparison list.


Avg. 16 Core Read Bench 30.3GB/s
Avg. 1 Core Write Bench 29.9GB/s

Good consistency

The range of scores (95th - 5th percentile) for the Corsair CM4X8GF2666C18S2 2x8GB is 28.9%. This is a relatively narrow range which indicates that the Corsair CM4X8GF2666C18S2 2x8GB performs reasonably consistently under varying real world conditions.


Avg. 1 Core Read Bench 16.6GB/s
Avg. Physical RAM Latency 74.1ns

Average Bench

(Based on 2,035 samples)
Min Avg Max
22.2 MC Read 30.3 35.4
20 MC Write 29.3 34.3
18.6 MC Mixed 22.9 29.4
78.6% 27.5 GB/s
Min Avg Max
9.13 SC Read 16.6 20.4
18.2 SC Write 29.9 36.4
13.9 SC Mixed 23 27.6
66.2% 23.2 GB/s
Min Avg Max
58.3 Latency 74.1 109
54% 74.1 ns
User Benchmarks Bench Multi core Single core Latency
The fastest RAM (mainstream) averages a speed of 100%
2 of 2 slots used
16GB SODIMM DDR4 clocked @ 2667 MHz
MC Read 34.6
MC Write 32.2
MC Mixed 29.6
92% 32.1 GB/s
SC Read 18.3
SC Write 23.9
SC Mixed 18.8
58% 20.3 GB/s
Latency 92.8
43% 92.8 ns
2 of 2 slots used
16GB SODIMM DDR4 clocked @ 2667 MHz
MC Read 30
MC Write 30.1
MC Mixed 23.3
79% 27.8 GB/s
SC Read 11.9
SC Write 25.9
SC Mixed 21.2
56% 19.7 GB/s
Latency 68.6
58% 68.6 ns
2 of 2 slots used
16GB SODIMM DDR4 clocked @ 2667 MHz
MC Read 28.5
MC Write 28.9
MC Mixed 21.4
75% 26.3 GB/s
SC Read 15.5
SC Write 30.2
SC Mixed 22.3
65% 22.7 GB/s
Latency 73.1
55% 73.1 ns
2 of 2 slots used
16GB SODIMM DDR4 clocked @ 2667 MHz
MC Read 24.2
MC Write 20
MC Mixed 21.5
62% 21.9 GB/s
SC Read 7.3
SC Write 9.2
SC Mixed 9.8
25% 8.77 GB/s
Latency 173
23% 173 ns
2,035 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 63,771,641 RAM Kits tested.

Typical CM4X8GF2666C18S2 2x8GB Builds (Compare 574 builds) See popular component choices, score breakdowns and rankings.
Gaming 14%
Tree trunk
Desktop 78%
Workstation 13%
Tree trunk

System: Standard Standard

EDIT WITH CUSTOM PC BUILDER Value: 193% - Outstanding Total price: $49

Popular CM4X8GF2666C18S2 2x8GB systems:

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  • - CPU tests include: integer, floating and string.
  • - GPU tests include: six 3D game simulations.
  • - Drive tests include: read, write, sustained write and mixed IO.
  • - RAM tests include: single/multi core bandwidth and latency.
  • - SkillBench (space shooter) tests user input accuracy.
  • - Reports are generated and presented on userbenchmark.com.
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Memory Kit Rankings (Price vs Performance) September 2023 RAM Rankings.

We calculate effective RAM speed which measures performance for typical desktop users. Effective speed is adjusted by current cost per GB to yield value for money. Our calculated values are checked against thousands of individual user ratings. The customizable table below combines these factors to bring you the definitive list of top Memory Kits. [RAMPro]


Group Test Results

  • Best user rated - User sentiment trumps benchmarks for this comparison.
  • Best value for money - Value for money is based on real world performance.
  • Fastest real world speed - Real World Speed measures performance for typical consumers.


115 Memory Kits (Compared) Thousands of user benchmarks compiled into one comparison list.

See how consistently different RAM Kits perform with varying real world conditions. The charts also illustrate overall performance, popularity and rank.

 Frequently Asked Questions

 Best User Rated

The Best.
Intel Core i5-13600K $310Nvidia RTX 4060 $300Crucial MX500 250GB $30
Intel Core i5-12400F $150Nvidia RTX 4060-Ti $397Samsung 850 Evo 120GB $60
Intel Core i5-12600K $215Nvidia RTX 3060-Ti $260Samsung 860 Evo 250GB $50
Seagate Barracuda 1TB (2016) $40Corsair Vengeance LPX DDR4 3200 C16 2x8GB $40SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $30Corsair Vengeance LPX DDR4 3000 C15 2x8GB $43SanDisk Extreme 32GB $28
Seagate Barracuda 2TB (2016) $50G.SKILL Trident Z DDR4 3200 C14 4x16GB $381SanDisk Ultra Fit 32GB $16
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